<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <input type="button" value="事件绑定" v-on:click='doIt'>
        <input type="button" value="事件绑定" @dblclick='doIt'>
        <h1>{{msg}}</h1>
    </div>
    
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el:'#app',
            data:{
                msg:'hello'
            },
            methods:{
                doIt(){
                    this.msg = 'world'
                    alert('hello world')
                }
            }
        })
    </script>
</body>
</html>